Co-extruded barrier laminating film refers to the barrier film produced by co-extruded laminating process. Co-extrusion composite process is a moulding method to prepare composite films by melting and plasticising two or more different plastics through two or more extruders, respectively, and feeding them into a single die. The co-extrusion lamination process for the production of barrier composite films (three-layer co-extruded composite film, for example) is illustrated below.

Barrier resin Adhesive resin Polyolefin resin
Extruder 1 Extruder 2 Extruder 3
Co-extrusion die head
Cooling
Drawing
Winding
Finished laminated film

According to the different process and equipment, co-extrusion lamination has two major categories: co-extrusion tube film method and co-extrusion flat film method. Co-extrusion tube film method, also known as co-extrusion blow moulding film method (or co-extrusion blowing method). This method uses a ring-shaped die (round tube-shaped die), using the film blowing process for film production, the product can be a cylindrical composite film, when the production of large-size products, and sometimes also in the film-making process will be a cylindrical film by the agent after cutting, as a flat film rolled. The main advantage of this method is that the price of equipment is relatively inexpensive, the replacement of the product mobility is strong; products for the decorative, bag making can reduce the seam sealing operation, bag making is convenient; the production process does not need to cut the edges, back to the furnace material is less, the finished product has a higher rate. Can also be in the production process, through the blowing ratio, stretch ratio and other process parameters set and adjusted to a certain extent to adjust the performance of the product, the production of longitudinal and transverse direction of the physical properties of a better balance or longitudinal and transverse direction of the performance of the product has a greater difference.

The co-extruded tube film method is divided into the up-blowing method and the down-blowing method, depending on the blowing method. Upper blowing method adopts air (wind ring) cooling, sometimes called air-cooled co-extrusion blow moulding film method, the advantage of this method is that the product specification can be adjusted to a larger range, the disadvantage is that the transparency of the film is poor. The lower blowing method adopts water ring cooling, so it is also called water ring cooling co-extrusion blow moulding method. Contrary to the upper blowing method, the advantage of this method is that the transparency of the product is higher, but it is more difficult to adjust the product specifications, and each width of the product must be equipped with a set of cooling and sizing device.

Co-extrusion flat film method, also known as co-extrusion cast film method. This method uses a flat sheet-like die (slit die), the use of cast film process film, the product is a flat sheet of composite film. The advantages of this method are higher film thickness accuracy, film thickness error is small; easy to quench the film through the roller, the film made of good transparency; high production efficiency (line speed), good economy, conducive to mass production.

Co-extrusion composite process and the fundamental difference between other composite processes is that it does not go through the process of preparing the base film (intermediate products), directly from the plastic particles produced by the multilayer composite film. In today's industrial production, more commonly used in the production of other composite flexible packaging materials composite process, such as dry composite, solvent-free composite, etc., must be all the materials need to be composite, pre-processed into a film-like substrate, and then adhesive methods to fit them together, extrusion, Weibu and other composite methods, but also the Department of the need to be composite of the material pre-processed into a film-like substrate. Therefore, the total extrusion composite has a short process route, less energy consumption, low production costs, environmental adaptability and other advantages of a series of awards, by the universal retreat is considered to be a should be in a generous promotion of the ‘tour of production’ process, so the total of the composite process is one of the first choice of the process of production of packaging materials of the barrier properties.

Nanjing Suminoe Precision Machinery Co., Ltd. is a collection of scientific research, production, sales in one of the high-tech enterprises, has always adhered to the integrity, equality, the customer's interests first business philosophy, in order to better improve the quality of the equipment, into a more professional and standardised production track. We set up a plastic sheet plate, casting, bi-directional stretching, non-woven nonwoven meltblown cloth, film composite, renewable granulation environmental protection recycling system and coating machine manufacturing system and other seven categories of equipment, independent research and development technology centre and production departments. We provide professional full set of technical solutions to meet the special needs of each customer. Among them, regarding the extrusion laminating manufacturing system, i.e. film laminator, the following production lines are available for customisation: PE double/triple co-extruded laminating production line, LDPE (3-in-1) laminating production line, PP,PE,PLA double-side laminating production line, aluminium foil high-speed laminating production line, PP spunbonded laminating production line, textile interlining fabrics laminating production line, hot-melt adhesive laminating production line, multi-layer extrusion laminating production line, graphene laminating production line and other laminating equipment. Graphene coated laminating line, Carbon fibre laminating line.